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v3.23.3

Summary of Significant Accounting Policies - Goodwill (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Goodwill [Line Items] |  |  |
Goodwill impairment | $ 0.0 | $ 0.0 | $ 0.0
Goodwill | 163.5 | 163.5 |
Home Building |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 134.3 | 134.3 |
Home Building | Northwest |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 2.2 | 2.2 |
Home Building | Southwest [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 0.0 | 0.0 |
Home Building | South Central [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 15.9 | 15.9 |
Home Building | Southeast [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 6.0 | 6.0 |
Home Building | East [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 60.5 | 60.5 |
Home Building | North |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 49.7 | 49.7 |
Eliminations and Other |  |  |
Goodwill [Line Items] |  |  |
Goodwill | $ 29.2 | $ 29.2 |

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